Square Roots of 81
In mathematics, a square root of a number is a number times itself equals the original number. For example, the square root of 9 is 3 because 3 times 3 equals 9.
The square root of 81 is 9 because 9 times 9 equals 81.
Questions about Square Roots of 81
- What is the square root of 81?
The answer is 9.
- How do you find the square root of 81?
You can use a calculator or a square root table. You can also use a number line.
- What are some other numbers that have a square root of 9?
The numbers 81, 6561, 729, and 8100 all have a square root of 9.
- Is there a negative square root of 81?
No, there is not. A square root is always positive.
- What is the square root of a negative number?
The square root of a negative number is a complex number.
Conclusion
The square root of 81 is 9. It is the only number that, when multiplied by itself, equals 81.